I think DOSbox glshaders/scalers do not look good /work right. They upscale for some reason... Example from log on World Rally Championship fever... Auto-switched to shader 'crt/vga-1080p'
2026-02-06 20:34:15.338 | SDL: Using standard SDI (auto) display refresh rate of 60 Hz Windows 11 oled tv.
2026-02-06 20:34:15.351 | DISPLAY: VGA 720x400 16-colour text mode 03h at 70.087 Hz throttled VFR, scaled to 1067x800 pixels with 1:1.35 (20:27) pixel aspect ratio

need to go to 640x400(double-scan) and maybe use standard of 640x480 emulated... will try to explain better and post more info...

The glscaler scaler standard may be the issue... On Windows 95/98 with crt monitor it had an option to use double-scan in a compatibilty mode (I think I remember from command and conquer red alert) So am trying to say upscale differently for 320x200 games. EDIT:
Learned about Pixel Aspect Ratio and DisplayPixel Aspect Ratio... PAR of 1:1.22 instead of 1:1 changes demensions of each pixel and is differant process than simply upscaling the on-screen image by an integer.